Pingus

Pingus is a free clone of the popular Lemmings game.

Your goal is
to guide a horde of penguins through a world full of obstacles and
penguin traps to safety. Although penguins (unlike lemmings) are rather
smart, they sometimes lack the necessary overview and now rely on you
to save them.

While Pingus is based on the idea of Lemmings, it has included
some
other ideas, which were not presented in the original Lemmings, such
as the worldmap or secret levels, which might be familiar
from games the Super Mario World and other Nintendo games.